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On Sunday, General Motors announced the sudden "resignation" of its high-profile marketing chief, Joel Ewanick, who oversaw its $4.5 billion advertising budget. So what led to the downfall of this major figure in GM's turnaround?

Last week, President Obama outlined a new energy policy that aims to reduce America's dependence on foreign oil by using more natural gas, wind and solar power, and encouraging manufacturers to build more fuel-efficient cars. But how can patient investors capitalize on these trends?

Zipcar members in San Francisco, Portland and Boston can try out Toyota's Prius plug-in hybrid, providing valuable info to Toyota before rolling the cars out to consumers in 2012. And Zipcar gets another way to make its greenhouse-gas conscious-customers happy.